FileStreamResult 无法识别 Asp.Net Core 2.2 中的多个 http 范围 [英] FileStreamResult doesn't recognize multiple http ranges in Asp.Net Core 2.2

问题描述

我有这么简单的端点:

[HttpGet]
public IActionResult GetFileDirect()
{
     var path = ...; // path to the file
     return File(System.IO.File.OpenRead(path), "text/plain", true);
}

当前文件内容:

abcdefghijklmnopqrstuvwxyz

abcdefghijklmnopqrstuvwxyz

正如您在返回语句中看到的，我为 enableRangeProcessing 传递了 true.它在单一范围请求的情况下按预期工作:

As you see in the return statement I am passing true for enableRangeProcessing. And it works as expected in case of single range request:

curl -H Range:bytes=0-8 http://localhost:65318/api/File -i

回复如下:

HTTP/1.1 206 Partial Content
Content-Length: 9
Content-Type: text/plain
Content-Range: bytes 0-8/26
Accept-Ranges: bytes
Server: Kestrel
X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcY2ViaXlcRGVza3RvcFxSYW5nZVdlYlxSYW5nZVdlYlxhcGlcRmlsZQ==?=
X-Powered-By: ASP.NET
Date: Sat, 02 Nov 2019 17:46:49 GMT

abcdefghi

但是，在多范围请求的情况下，它不会考虑任何范围并返回带有文件完整内容的 Ok 响应:

But, in case of multi range request, it just won't consider any range and will return Ok response with full content of the file:

curl -H  Range:bytes=0-8,12-15 http://localhost:65318/api/File -i

回复如下:

HTTP/1.1 200 OK
Content-Length: 26
Content-Type: text/plain
Accept-Ranges: bytes
Server: Kestrel
X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcY2ViaXlcRGVza3RvcFxSYW5nZVdlYlxSYW5nZVdlYlxhcGlcRmlsZQ==?=
X-Powered-By: ASP.NET
Date: Sat, 02 Nov 2019 17:49:37 GMT

abcdefghijklmnopqrstuvwxyz

推荐答案

我比 @Nkosi 更深入地研究了源代码，以找到解析范围的位置，请查看 Asp.NetCore>

I dived to source code a little deeper than @Nkosi to find the place where ranges are parsed, look at AspNetCore - RangeHelper.cs

if (rawRangeHeader.Count > 1 || rawRangeHeader[0].IndexOf(',') >= 0)
{
    logger.LogDebug("Multiple ranges are not supported.");

    // The spec allows for multiple ranges but we choose not to support them because the client may request
    // very strange ranges (e.g. each byte separately, overlapping ranges, etc.) that could negatively
    // impact the server. Ignore the header and serve the response normally.               
    return (false, null);
}

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